With a motion-activated camera, two-way audio and HD video, you'll never miss a visitor again. Ring detects motion and can alert you on your mobile device, even at night thanks to built-in infrared LED night vision. Optionally, video can be archived to the cloud for later viewing. See, hear and speak to whomever is at your door in real time from your smartphone, tablet or desktop. Day or night, rain or shine -- you're always home. Right now the Ring Video Doorbell Pro is discounted 20%, or $50, on Amazon. Its typical list price of $249 has dropped to $199.99 (see Ring Video Doorbell Pro now on Amazon). That's a deal that doesn't come around very often.